Remove the FF usage_data_unique_users_committing_ciconfigfile

It has been enabled by default for 2 milestones

Changelog: other

config/feature_flags/development/usage_data_unique_users_committing_ciconfigfile.yml

----
-name: usage_data_unique_users_committing_ciconfigfile
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/52172
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/299403
-milestone: '13.9'
-type: development
-group: group::pipeline authoring
-default_enabled: true

lib/gitlab/usage_data_counters/known_events/common.yml

@@ -351,7 +351,6 @@
   category: pipeline_authoring
   redis_slot: pipeline_authoring
   aggregation: weekly
-  feature_flag: usage_data_unique_users_committing_ciconfigfile
 - name: o_pipeline_authoring_unique_users_pushing_mr_ciconfigfile
   category: pipeline_authoring
   redis_slot: pipeline_authoring